Imikhuba Nokuhlolwa Kokuxazulula Izinkinga Zekhemistri

Funda umbuzo ukuze uthole inani eliqondiwe neyunithi yalo

Ngaphambi kokuthinta isibali, thola umusho obuza okuthile bese ubhala okuqondiwe njengenani elinayunithi, njengobukhulu befoyili, ngama-cm. Okuqondiwe okubhaliwe kukuvimbela ukuma ngenani eliphakathi, njengama-mole, lapho umbuzo ufuna amagremu.

Okulandelayo, cabanga uhlu lwamanani anikeziwe ngayunithi nezinombolo ezibalulekile, bese umaka ukuthi yiziphi izinombolo eziqondile. Izinto ezibaliwe nobudlelwano obuchaziwe, njengo-1 L = 1000 mL noma izinombolo ezandulela ku-equation elinganisiwe, ziqondile futhi azikhawuleli ukucophelela. Qaphela nolwazi oluthinteke: i-oxygen eyeqile ikutshela ukuthi iyiphi i-reactant engakhawuleli.

Ekugcineni, qamba ubudlelwano obuxhuma okunikeziwe nokuqondiwe: ukuminyana, isisindo se-molar, isilinganiso sama-mole noma i-molarity. Uma ungakwazi ukuqamba oyodwa, funda kabusha umbuzo; ukubala okuningi akuzugcwalisa umqondo ongekho.

Thatha amayunithi kuso sonke isinyathelo

Bhala iyunithi eduze kwenombolo ngayinye, kuhlanganise nemiphumela ephakathi, bese ukhansela amayunithi njengoba uqhubeka. Lokhu kuyi-dimensional analysis esetshenziswa njengokuhlola okuqhubekayo: uma amayunithi asalayo engezona amayunithi okuqondiwe, ukusetha akulungile, noma ngabe inombolo ibonakala iyafaneleka kangakanani. Isici sokuguqula esiphendulwe sibonakala masinyane, ngoba g × (g/mol) kushiya g²/mol, okungeyona inani lanoma yini.

Cacisa ngama-prefix. Ukubhala u-25.0 mL njengo-0.0250 L ngaphambi kokusebenzisa i-molarity ngo-mol/L kukhipha iphutha lesici sika-1000 elivele ligwenywe kalula.

Lapho kuvela into engaphezu kweyodwa, yenza ubuwena bayo ube yingxenye yeyunithi: i-mol AgNO₃ ne-mol Ag zingamanani ahlukile, futhi ukuzibiza kwenza isinyathelo sesilinganiso sama-mole sibe nzima ukusweleka.

Linganisa kuqala, bese uqhathanisa nesibali

Yisa inani ngalinye elinikeziwe kunombolo eyodwa noma ezimbili ezibalulekile bese wenza izibalo engqondweni. Ukulinganisa kudinga kuphela amandla eshumi alungile nenombolo yokuqala efanele. Kubhale phansi ngaphambi kokubala inani eliqondile.

Bese uqhathanisa. Umehluko wesici seshumi noma ngaphezulu ukhomba iphutha le-prefix, iphutha lokufaka ukubhala kwesayensi, noma isilinganiso esisetshenziswe sibheke phansi. Isici esincane senombolo ephelele esifana no-2 noma 3 sikhomba izilinganiso zama-mole noma izinombolo ezingezansi. Ukuvumelana akufakazeli ukuthi impendulo ilungile, kodwa ukungavumelani kubonisa ukuthi kukhona okungalungile.

Engeza ukuhlola kwengqondo yokwenyama lapho kukhona. Izisindo, amavolumu, ukugxila namazinga okushisa aphelele kuhle. Iphesenti lesivuno alikwazi ukudlula ku-100% emkhiqizweni ocwebile, owomile. Isixazululo esihlanjululiwe asigxilile kangako kunesiphuzo saso sokuqala.

Isibonelo esisebenzile: ubukhulu bephepha le-aluminium foil

Ucezu oluyunxande lwe-aluminium foil lulinganisa u-30.5 cm ngo-22.0 cm futhi lunesisindo esingu-4.37 g. Ukuminyana kwe-aluminium kungu-2.70 g/cm³. Ifoyili ijiya kangakanani? Okuqondiwe ubukhulu ngama-cm. Ubudlelwano ngukuthi ivolumu = isisindo ÷ ukuminyana futhi, ephepheni elincane, ivolumu = ubude × ububanzi × ubukhulu.

Ukulinganisa: 4.4 g ÷ 2.7 g/cm³ icishe ibe ngu-1.6 cm³, futhi indawo icishe ibe ngu-30 cm × 22 cm ≈ 660 cm². Ubukhulu bube cishe 1.6 cm³ ÷ 660 cm² ≈ 0.0024 cm.

Bala: V = 4.37 g ÷ 2.70 g/cm³ = 1.6185 cm³, kugcinwa izinombolo ezengeziwe okwamanje. A = 30.5 cm × 22.0 cm = 671 cm². t = 1.6185 cm³ ÷ 671 cm² = 0.002412 cm. Wonke inani elilinganisiwe linezinombolo ezibalulekile ezintathu, ngakho bika t = 2.41 × 10⁻³ cm, okungu-24.1 µm. Amayunithi akhansela abe ngu-cm, futhi umphumela uvumelana nokulinganisa.

Ukufaneleka: u-24.1 µm mncane kakhulu kunephepha, okuhambisana nendlela ifoyili ethanda ukuziphatha ngayo. Impendulo engu-2.41 cm ibingahluleka kulokhu kuhlola ngokushesha.

Isibonelo esisebenzile: ukubala ama-athomu ekhyubhini likashukela

Mangaki ama-athomu e-carbon akhyubhini likashukela elingu-4.20 g, kuthathwa njenge-sucrose ecwebile, C₁₂H₂₂O₁₁? Okuqondiwe inombolo yama-athomu e-C. Indlela ngokulandelana ngu-amagremu e-sucrose → ama-mole e-sucrose → amamolekyuli e-sucrose → ama-athomu e-carbon. Bhala indlela ngaphambi kokubala; umcibisholo ngamunye uyisici esisodwa sokuguqula.

Isisindo se-molar, usebenzisa izisindo ze-athomu ezijwayelekile ze-IUPAC eziyiswe emadesimalini amabili (C 12.01, H 1.01, O 16.00): 12(12.01) + 22(1.01) + 11(16.00) = 144.12 + 22.22 + 176.00 = 342.34 g/mol. Ukulinganisa: 4 g ÷ 340 g/mol ≈ 0.012 mol; 0.012 mol × 6 × 10²³ mol⁻¹ ≈ 7 × 10²¹ amamolekyuli; × 12 ≈ 8 × 10²² ama-athomu e-carbon.

Bala: 4.20 g × (1 mol / 342.34 g) = 0.012269 mol ye-sucrose. 0.012269 mol × 6.022 × 10²³ amamolekyuli/mol = 7.388 × 10²¹ amamolekyuli. 7.388 × 10²¹ amamolekyuli × 12 ama-athomu e-C/imolekyuli = 8.866 × 10²² ama-athomu e-C, kubikwe njengo-8.87 × 10²² ngoba u-4.20 g unezinombolo ezibalulekile ezintathu. U-12 uqondile, futhi isisindo se-molar nesilinganiso esingaguquki sika-Avogadro zinezinombolo eziningi kunesisindo. Ukulinganisa kuyavumelana.

Ukuyisa inani ku-0.01 mol esinyathelweni sokuqala bekuzonikeza u-7.23 × 10²², cishe ngu-18% ngaphansi. Thatha izinombolo ezengeziwe emasinyathelweni aphakathi bese uyisa kanye, ekugcineni.

Hlela izinkinga zamasinyathelo amaningi njengemephu yamanani

Ezinkingeni ezinamasinyathelo amathathu noma ngaphezulu, dweba imephu ngaphambi kokubala: amabhokisi amanani (isisindo se-A, ama-mole e-A, ama-mole e-B) nemicibisholo enegama lobudlelwano obuwaxhumayo (isisindo se-molar, isilinganiso sama-mole). Imephu yehlukanisa ukunquma ukuthi yini okufanele kwenziwe nokwenza izibalo.

Sebenza phambili usuka kokunikeziwe noma emuva usuka okuqondiwe, noma yikuphi okunamagatsha ambalwa. Ukucabanga emuva kuyasiza lapho inkinga inikeza idatha eningi: buza ukuthi yini ongayidinga ukubala okuqondiwe, bese yini ongayidinga ukuthola lokho, kuze kube yilapho ufinyelela emanani anikeziwe.

Gcina ukuguqula okukodwa emugqeni ngamunye, nayunithi namagama ezinto, ukuze impendulo engalungile ilandelelwe esinyathelweni esehlulekile.

• Bhala inani eliqondiwe neyunithi yalo.
• Qamba ubudlelwano ngabunye futhi udwebe indlela esuka kokunikeziwe iye okuqondiwe.
• Linganisa impendulo kunombolo eyodwa ebalulekile.
• Bala, uthatha izinombolo ezengeziwe emiphumeleni ephakathi.
• Yisa kanye, ekugcineni, ube nenani elifanele lezinombolo ezibalulekile.
• Qhathanisa nokulinganisa futhi uhlole ukuthi kunengqondo yini ngokwenyama.

Amaphutha avamile nokuhlolwa okuwabambayo

Amaphutha angezansi avame ukwenzeka ekhemistri evamile, futhi ngamunye unokuhlola okusheshayo okungadingi ukuphinda inkinga yonke.

Uma uthola iphutha emsebenzini wakho, qaphela ukuthi yimuphi umkhuba obuzolibamba, futhi upha iphethini lakho elivame kakhulu ukuhlola okuhlosiwe njalo.

• Ukumisa ngenani eliphakathi, njengokubika ama-mole lapho kwabuzwa amagremu. Hlola: qhathanisa iyunithi yokugcina nokuqondiwe obukubhale ekuqaleni.
• Ukuthayipha u-6.022 × 10²³ njengo-6.022 × 10 EE 23, isibali esikufunda njengo-6.022 × 10²⁴. Hlola: cindezela i-EE noma i-EXP ngqo ngemuva kuka-6.022, futhi uqhathanise amandla eshumi nokulinganisa kwakho.
• Ukuxuba u-mL no-L ekubaleni okusebenzisa u-mol/L. Hlola: amayunithi awakhanseli abe yilokho okuqondiwe.
• Ukuphendula isici sokuguqula. Hlola: amayunithi asalayo afana no-g²/mol.
• Ukuyisa imiphumela ephakathi. Hlola: phinda isinyathelo sokugcina ngamanani angayiswanga; uma izinombolo ezibikiwe zishintsha, thatha ezengeziwe.
• Ukuvumela inombolo eqondile, njengenombolo eyandulelayo noma ama-athomu e-carbon angu-12 ku-sucrose, ukukhawulela izinombolo ezibalulekile.
• Ukwamukela inani elingenakwenzeka ngokwenyama, njengesisindo esingaphansi kuka-zero, iphesenti lesivuno elingaphezu kuka-100%, noma ukugxila okukhulayo lapho kuhlanjululwa.